Bank Fixed deposit posting

Hi

Our client frequently uses Fixed deposits with their banks as collateral.

In order to enter these FDs in the system we have created a vendor account group for them. Then using F-48 we create the FD amount as a vendor advance.

However the client wishes to have some sort of due date availible for the FD when entering in F-48, so that in a similar way to normal vendor invoices we can get information on when item is due for maturation.

Is there any field we can update in order to set a due date?